It's GSA Backlink software, basically it works on footprints or I would say boolean strings to search for the target website enter the details and boom. But it was a old thing, now websites are smart, they use recaptcha and all.

If @op is asking about automate link building tool then I would like to suggest to avoid it because it is so risky and it may lead to losing the ranking position of your website or your website may be penalized by Google!!